bl1

bits 32
boot2:
mov ax, DATA_SEG
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
mov esi,hello
mov ebx,0xb8000

.loop:
lodsb
or al,al
jz printcr0
or eax,0x0100           ; <----- this looks wrong as it uses junk already in EAX
mov word [ebx], ax
add ebx,2
jmp .loop

hello: db "Hello world!",0

printcr0:
mov edx, cr0
mov ecx, 8           ; 8 nibbles (groups of 4 bits) in a dword
;mov ebx, 000B8000h  ; Remove this and continue with the previous value
                     ;     in EBX after Hello world! printed
.loop:
rol edx, 4
mov eax, edx
and eax, 15
add eax, 00000130h
cmp al, '9'          ; "0" to "9" are fine
jbe .ok
add eax, 7           ; This produces "A" to "F"
.ok:
mov [ebx], ax
add ebx, 2
dec ecx
jnz .loop
halt:
cli
hlt
jmp halt